[Sync] Move sync thread ownership to ProfileSyncService.

components/sync/driver/glue/sync_backend_host_impl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_HOST_IMPL_H_
 #define COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_HOST_IMPL_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 57 matching lines @@
       SyncClient* sync_client,
       const scoped_refptr<base::SingleThreadTaskRunner>& ui_thread,
       invalidation::InvalidationService* invalidator,
       const base::WeakPtr<SyncPrefs>& sync_prefs,
       const base::FilePath& sync_folder);
   ~SyncBackendHostImpl() override;
 
   // SyncBackendHost implementation.
   void Initialize(
       SyncFrontend* frontend,
-      std::unique_ptr<base::Thread> sync_thread,
+      base::Thread* sync_thread,
       const scoped_refptr<base::SingleThreadTaskRunner>& db_thread,
       const scoped_refptr<base::SingleThreadTaskRunner>& file_thread,
       const WeakHandle<JsEventHandler>& event_handler,
       const GURL& service_url,
       const std::string& sync_user_agent,
       const SyncCredentials& credentials,
       bool delete_sync_data_folder,
       bool enable_local_sync_backend,
       const base::FilePath& local_sync_backend_folder,
       std::unique_ptr<SyncManagerFactory> sync_manager_factory,
       const WeakHandle<UnrecoverableErrorHandler>& unrecoverable_error_handler,
       const base::Closure& report_unrecoverable_error_function,
       const HttpPostProviderFactoryGetter& http_post_provider_factory_getter,
       std::unique_ptr<SyncEncryptionHandler::NigoriState> saved_nigori_state)
       override;
   void TriggerRefresh(const ModelTypeSet& types) override;
   void UpdateCredentials(const SyncCredentials& credentials) override;
   void StartSyncingWithServer() override;
   void SetEncryptionPassphrase(const std::string& passphrase,
                                bool is_explicit) override;
   bool SetDecryptionPassphrase(const std::string& passphrase) override
       WARN_UNUSED_RESULT;
   void StopSyncingForShutdown() override;
-  std::unique_ptr<base::Thread> Shutdown(ShutdownReason reason) override;
+  void Shutdown(ShutdownReason reason) override;
   void UnregisterInvalidationIds() override;
   ModelTypeSet ConfigureDataTypes(
       ConfigureReason reason,
       const DataTypeConfigStateMap& config_state_map,
       const base::Callback<void(ModelTypeSet, ModelTypeSet)>& ready_task,
       const base::Callback<void()>& retry_callback) override;
   void ActivateDirectoryDataType(ModelType type,
                                  ModelSafeGroup group,
                                  ChangeProcessor* change_processor) override;
   void DeactivateDirectoryDataType(ModelType type) override;
   void ActivateNonBlockingDataType(ModelType type,
                                    std::unique_ptr<ActivationContext>) override;
   void DeactivateNonBlockingDataType(ModelType type) override;
   void EnableEncryptEverything() override;
   UserShare* GetUserShare() const override;
   Status GetDetailedStatus() override;
   SyncCycleSnapshot GetLastCycleSnapshot() const override;
   bool HasUnsyncedItems() const override;
   bool IsNigoriEnabled() const override;
   PassphraseType GetPassphraseType() const override;
   base::Time GetExplicitPassphraseTime() const override;
   bool IsCryptographerReady(const BaseTransaction* trans) const override;
   void GetModelSafeRoutingInfo(ModelSafeRoutingInfo* out) const override;
   void FlushDirectory() const override;
   void RequestBufferedProtocolEventsAndEnableForwarding() override;
   void DisableProtocolEventForwarding() override;
   void EnableDirectoryTypeDebugInfoForwarding() override;
   void DisableDirectoryTypeDebugInfoForwarding() override;
-  base::MessageLoop* GetSyncLoopForTesting() override;
   void RefreshTypesForTest(ModelTypeSet types) override;
   void ClearServerData(
       const SyncManager::ClearServerDataCallback& callback) override;
   void OnCookieJarChanged(bool account_mismatch, bool empty_jar) override;
 
   // InvalidationHandler implementation.
   void OnInvalidatorStateChange(InvalidatorState state) override;
   void OnIncomingInvalidation(
       const ObjectIdInvalidationMap& invalidation_map) override;
   std::string GetOwnerName() const override;
@@ skipping 152 matching lines @@
 
   void ClearServerDataDoneOnFrontendLoop(
       const SyncManager::ClearServerDataCallback& frontend_callback);
 
   // A reference to the TaskRUnner used to construct |this|, so we know how to
   // safely talk back to the SyncFrontend.
   scoped_refptr<base::SingleThreadTaskRunner> const frontend_task_runner_;
 
   SyncClient* const sync_client_;
 
+  // A pointer to the sync thread.
+  base::Thread* sync_thread_;
+
   // The UI thread's task runner.
   const scoped_refptr<base::SingleThreadTaskRunner> ui_thread_;
 
   // Name used for debugging (set from profile_->GetDebugName()).
   const std::string name_;
 
   // Our core, which communicates directly to the syncapi. Use refptr instead
   // of WeakHandle because |core_| is created on UI loop but released on
   // sync loop.
   scoped_refptr<SyncBackendHostCore> core_;
@@ skipping 38 matching lines @@
   bool invalidation_handler_registered_;
 
   base::WeakPtrFactory<SyncBackendHostImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncBackendHostImpl);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_HOST_IMPL_H_